Credit: The Associated Press

This image made from Egyptian State Television shows Egypt's interim president Adly Mansour speaking after being sworn in at the constitutional court in Cairo, Thursday, July 4, 2013. Egypt's chief justice of the Supreme Constitutional Court has been sworn in as interim president after Egyptians awoke Thursday to a new political reality after the military overthrew the country's first democratically elected president after only a year in office.

Credit: The Associated Press

An opponent of Egypt's Islamist leader Mohammed Morsi lights fireworks during a celebration outside the presidential palace in Cairo, Egypt, Wednesday, July 3, 2013. A statement on the Egyptian president's office's Twitter account has quoted Mohammed Morsi as calling military measures "a full coup." The denouncement was posted shortly after the Egyptian military announced it was ousting Morsi, who was Egypt's first freely elected leader but drew ire with his Islamist leanings. The military says it has replaced him with the chief justice of the Supreme constitutional Court, called for early presidential election and suspended the Islamist-backed constitution. (AP Photo/Khalil Hamra)

Credit: The Associated Press

Egyptians wave national flags as fireworks light the sky over Tahrir Square, where hundreds thousands opponents of Egypt's Islamist President Mohammed Morsi celebrate in Cairo, Egypt, Wednesday, July 3, 2013. A statement on the Egyptian president's office's Twitter account has quoted Mohammed Morsi as calling military measures "a full coup." The denouncement was posted shortly after the Egyptian military announced it was ousting Morsi, who was Egypt's first freely elected leader but drew ire with his Islamist leanings. The military says it has replaced him with the chief justice of the Supreme constitutional Court, called for early presidential election and suspended the Islamist-backed constitution. (AP Photo/Amr Nabil)

Credit: The Associated Press

Egyptians celebrate at a tea house at Defense Minister Gen. Abdel-Fattah el-Sissi's announcement in Cairo's Zamalek district Wednesday, July 3, 2013. Egypt's military has suspended the Islamist-backed constitution and called early elections. The military also announced that embattled President Mohammed Morsi will be replaced.Cheers erupted among millions of protesters nationwide who were demanding Morsi's ouster.(AP Photo/Hiro Komae)

Credit: The Associated Press

FILE - In this Friday, July 13, 2012 file photo, Egyptian President Mohammed Morsi holds a joint news conference with Tunisian President Moncef Marzouki, unseen, at the Presidential palace in Cairo, Egypt. A statement on the Egyptian president's office's Twitter account has quoted Mohammed Morsi as calling military measures "a full coup." The denouncement was posted shortly after the Egyptian military announced it was ousting Morsi, who was Egypt's first freely elected leader but drew ire with his Islamist leanings. The military says it has replaced him with the chief justice of the Supreme constitutional Court, called for early presidential election and suspended the Islamist-backed constitution. (AP Photo/Maya Alleruzzo, File)

Credit: The Associated Press

Egyptian protesters chant slogans against Egyptian Islamist President Mohammed Morsi in Tahrir Square in Cairo, Wednesday, July 3, 2013. A statement on the Egyptian president's office's Twitter account has quoted Mohammed Morsi as calling military measures "a full coup." The denouncement was posted shortly after the Egyptian military announced it was ousting Morsi, who was Egypt's first freely elected leader but drew ire with his Islamist leanings. The military says it has replaced him with the chief justice of the Supreme constitutional Court, called for early presidential election and suspended the Islamist-backed constitution. (AP Photo/ Manu Brabo)

Credit: The Associated Press

An opponent of Egypt's Islamist President Mohammed Morsi chants slogans during a protest outside the presidential palace, in Cairo, Egypt, Wednesday, July 3, 2013.

Credit: The Associated Press

This image made from video shows Lt. Gen. Abdel-Fattah el-Sissi addressing the nation on Egyptian State Television Wednesday, July 3, 2013. Egypt's military chief says president is replaced by chief justice of constitutional court. (AP Photo/Egyptian State Television)

Credit: The Associated Press

Opponents of Egypt's Islamist President Mohammed Morsi celebrate as they light flares and wave national flags and his picture with Arabic reads, "leave", in Tahrir Square in Cairo, Egypt, Wednesday, July 3, 2013.

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CAIRO — Egypt's military moved swiftly Thursday against senior figures of the Muslim Brotherhood, targeting the backbone of support for ousted President Mohammed Morsi. In the most dramatic step, authorities arrested the group's revered leader from a seaside villa and flew him by helicopter to detention in the capital.

With a top judge newly sworn in as interim president to replace Morsi, the crackdown poses an immediate test to the new army-backed leadership's promises to guide Egypt to democracy: The question of how to include the 83-year-old fundamentalist group.